linux-kernel - Re: [PATCH] wireless-2.6 zd1211rw check against regulatory domain rather than hardcoded value of 11

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Message-ID: <453D48E5.8040100@gentoo.org>
Date:	Mon, 23 Oct 2006 18:57:41 -0400
From:	Daniel Drake <dsd@...too.org>
To:	Holden Karau <holden@...scanfly.ca>
CC:	zd1211-devs@...ts.sourceforge.net, linville@...driver.com,
	netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org,
	holdenk@...dros.com, Ulrich Kunitz <kune@...ne-taler.de>
Subject: Re: [PATCH] wireless-2.6 zd1211rw check against regulatory domain
 rather than hardcoded value of 11

Holden Karau wrote:
> From: Holden Karau <holden@...scanfly.ca> http://www.holdenkarau.com
> 
> I have made a small patch for the zd1211rw driver which uses the
> boundry channels of the regulatory domain, rather than the hard coded
> values of 1 & 11.
> Signed-off-by: Holden Karau <holden@...scanfly.ca> 
> http://www.holdenkarau.com

Thanks for the patch! Please always look up the MAINTAINERS entry for 
the code you are modifying and CC the developers on patches.

Comments below, all minor points.

> I'm not entirely sure how useful this patch is, but it seems like a
> good idea. If its totally misguided, let me know :-) In case the patch
> gets mangled I've put it up at
> http://www.holdenkarau.com/~holden/projects/zd1211rw/zd1211rw-use-geo-for-channels.patch 

Your mailer ate tabs and wrapped long lines. You're going to need to fix 
that.

> --- a/drivers/net/wireless/zd1211rw/zd_chip.c    2006-10-23
> 10:07:39.000000000 -0400
> +++ b/drivers/net/wireless/zd1211rw/zd_chip.c    2006-10-23
> 10:41:51.000000000 -0400
> @@ -38,6 +38,8 @@ void zd_chip_init(struct zd_chip *chip,
>     mutex_init(&chip->mutex);
>     zd_usb_init(&chip->usb, netdev, intf);
>     zd_rf_init(&chip->rf);
> +    /* The chip needs to know which geo it is in */
> +    chip->geo = 
> ieee80211_get_geo(zd_mac_to_ieee80211(zd_netdev_mac(netdev)));

There is no need to store a geo reference here. You can use 
zd_chip_to_mac() to go from chip to mac, then mac-to-ieee80211 is easy.

> }
> 
> void zd_chip_clear(struct zd_chip *chip)
> @@ -606,14 +608,17 @@ static int patch_6m_band_edge(struct zd_
>         { CR128, 0x14 }, { CR129, 0x12 }, { CR130, 0x10 },
>         { CR47,  0x1e },
>     };
> +    struct ieee80211_geo *geo = chip->geo;
> 
>     if (!chip->patch_6m_band_edge || !chip->rf.patch_6m_band_edge)
>         return 0;
> 
> -    /* FIXME: Channel 11 is not the edge for all regulatory domains. */
> -    if (channel == 1 || channel == 11)
> +    /* Checks the channel boundry of the region */
> +    dev_dbg_f("checking boundry == %d || %d\n" , 1 , geo->bg_channels);
> +    if (channel == 1 || channel == geo->bg_channels)

Typo, you mean boundary. Also, I think the debug message can go once 
you're confident it's working correctly.

>         ioreqs[0].value = 0x12;
> 
> +

This added line could go as well.

>     dev_dbg_f(zd_chip_dev(chip), "patching for channel %d\n", channel);
>     return zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
> }

I think that after the above changes, your modifications to zd_chip.h 
can be removed.

> --- a/drivers/net/wireless/zd1211rw/zd_chip.h    2006-10-23
> 10:07:39.000000000 -0400
> +++ b/drivers/net/wireless/zd1211rw/zd_chip.h    2006-10-23
> 10:39:08.000000000 -0400
> @@ -21,6 +21,8 @@
> #include "zd_types.h"
> #include "zd_rf.h"
> #include "zd_usb.h"
> +#include "zd_ieee80211.h"
> +#include <linux/wireless.h>
> 
> /* Header for the Media Access Controller (MAC) and the Baseband Processor
>  * (BBP). It appears that the ZD1211 wraps the old ZD1205 with USB glue and
> @@ -669,6 +671,7 @@ struct zd_chip {
>     /* SetPointOFDM in the vendor driver */
>     u8 ofdm_cal_values[3][E2P_CHANNEL_COUNT];
>     u16 link_led;
> +      struct ieee80211_geo* geo;
>     unsigned int pa_type:4,
>         patch_cck_gain:1, patch_cr157:1, patch_6m_band_edge:1,
>         new_phy_layout:1,
> -
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> 

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